US 12,479,067 B2
Patterned abrasive substrate and method
Joseph B. Eckel, Vadnais Heights, MN (US); Aaron K. Nienaber, Lake Elmo, MN (US); Thomas J. Nelson, Woodbury, MN (US); Ann M. Hawkins, Lake Elmo, MN (US); and Amelia W. Koenig, Minneapolis, MN (US)
Assigned to 3M Innovative Properties Company, St. Paul, MN (US)
Appl. No. 17/415,071
Filed by 3M INNOVATIVE PROPERTIES COMPANY, St. Paul, MN (US)
PCT Filed Dec. 17, 2019, PCT No. PCT/IB2019/060947
§ 371(c)(1), (2) Date Jun. 17, 2021,
PCT Pub. No. WO2020/128852, PCT Pub. Date Jun. 25, 2020.
Claims priority of provisional application 62/781,021, filed on Dec. 18, 2018.
Prior Publication US 2022/0040814 A1, Feb. 10, 2022
Int. Cl. B24D 3/28 (2006.01)
CPC B24D 3/28 (2013.01) [B24D 2203/00 (2013.01)] 13 Claims
OG exemplary drawing
 
1. An abrasive article, comprising:
a backing substrate; a plurality of particles on the backing substrate adhered to the backing substrate by a make coat, including;
a plurality of shaped ceramic abrasive particles consisting essentially of sintered alpha alumina;
a plurality of wear indicating particles having a height that is less than a height of the plurality of shaped ceramic abrasive particles, wherein when exposed, the plurality of wear indicating particles are configured to communicate an end of product life to a user, wherein the plurality of wear indicating particles are colored differently from the plurality of shaped ceramic abrasive particles and are positioned on the backing to form one or more symbols; and
a concealing layer,
wherein when the abrasive article is new, the plurality of wear indicating particles are hidden from view by the concealing layer and portions of the plurality of shaped ceramic abrasive particles are visible above the concealing layer.